Test button on SAS generator produces 404 error

Attempting to generate an SAS for a container, based on a profile. The SAS is generated, but pressing the test button opens the URL in IE and produces a '404 resource not found' message. Anyone else get the "test" button on SAS generator to work?

Manually adding the version number to the URL seems to get farther (&sv=2012-02-12), but still getting errors for missing headers.